Heap corruption via wrapped DWA plane offset
Published Apr 21, 2026 · Updated Apr 21, 2026
Integer overflow in OpenEXR DWA decoding allows attackers to corrupt heap memory by opening a crafted DWAA or DWAB EXR file. In setupChannelData, line 1722 multiplies the signed 32-bit channel width and height without size_t promotion, then uses the wrapped result as a planarUncRle byte offset that aliases buffer regions. A user or image-processing pipeline must open a large-dimension file with a non-DCT channel; subsequent RLE decoding writes through the aliased pointers and corrupts the process heap.
Summary
What happened
Integer overflow in OpenEXR DWA decoding allows attackers to corrupt heap memory by opening a crafted DWAA or DWAB EXR file. In setupChannelData, line 1722 multiplies the signed 32-bit channel width and height without size_t promotion, then uses the wrapped result as a planarUncRle byte offset that aliases buffer regions. A user or image-processing pipeline must open a large-dimension file with a non-DCT channel; subsequent RLE decoding writes through the aliased pointers and corrupts the process heap.
The record
- CVE
- CVE-2026-40244
- Published
- Apr 21, 2026
- Updated
- Apr 21, 2026
- Vendor
- Academy Software Foundation
- Product
- OpenEXR
- Classifications
- CWE-190, T1204.002
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 21, 2026CVE publishedPublication date reported by the CVE source.
- Apr 21, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=>= 3.2.0, < 3.2.8
- Affected versionversion=>= 3.3.0, < 3.3.10
- Affected versionversion=>= 3.4.0, < 3.4.10
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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